[ubuntu] Ubuntu 12.04 LTS: Network stops working after replacing the mainboard

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http://ubuntuforums.org – Hi! I have searched the web, kept bugging fellow co-workers a lot on the issue but couldn't find any solution that helped me fixing my problem so I'm asking my question here before I think I have to face reinstalling my machine taking this into consideration. The situation: I have run a PC-system with Ubuntu 12.04 LTS installed. The mainboard or the processor broke (told me something about it couldn't bring up core 2 and/or 3 out of 4 during booting the system - for what reason ever) hence I decided to go for new hardware as this rendered me unable to boot the machine. Upgrading the hardwar (Hardware)